1��EFFICIENT COMMUNICATION FUNCTION: The communication module can carry out telephone voice, SMS sending and receiving functions, and is equipped with Bluetooth transmission process, a module connection for a variety of uses, adding more diversified choices for your communication line 2��EXTENSIVE NETWORK COVERAGE: The module support GSM GPRS network frequencies of 850, 900, 1800, 1900MHz, ensuring global coverage and efficient and smooth communication no matter where you are located 3��SIMPLIFIED OPERATION EXPERIENCE: The communication module can be automatically turned on and connected to the network after power on, the operation process is simple and convenient, eliminating the hassle of manual key operation, so that you can enjoy the convenience brought by technology, but also more focused on innovation and design 4��REAL TIME WORKING STATUS: USB to GSM GPRS module has a working indicator red LED. When there is no network, no SIM card or SIM card inserted, the LED light flash quickly every 1 second, and flash once every 3 seconds for normal access to the network, so that you can clearly understand the module working at any time 5��HIGH SPEED DATA TRANSMISSION: Even under the 2G network, the module also support GPRS data transmission to ensure continuous data update, reduce data latency, and more effectively respond to occasion such as mobile meter reading that require real time data 6��EXCELLENT COMPATIBILITY: The GSM GPRS communication module is equipped with the CH340T USB to serial port chip, the driver installation is simple and the compatibility is high, and can easily cooperate with all kinds of hardware devices, solving the worry of equipment coordination Item Type: GSM GPRS Module Material: PCB Functions: Telephone voice, SMS sending and receiving, Bluetooth transmission, etc. Network Frequency: GSM GPRS 850, 900, 1800, 1900MHz SIM Card Type: MicroSIM(not included) Product Features: 1. Onboard SIM800C GSM GPRS module 2. On board CH340T USB to serial chip, easy driver installation, high compatibility 3. The module is powered on automatically and connected to the network. No button is required to control the startup 4. Support SMS sending and receiving 5. Support GPRS data transmission under 2G network, can be applied to mobile meter reading and other occasion 6. Support Bluetooth data transmission, IEEE802.15 Bluetooth standard, 2.4GHz working band 7. Support adaptive baud rate 8. With the work indicator red LED, no network, no SIM card or SIM card inserted in the reverse LED blink at a quick interval of 1 second, normal access to the network once every 3 seconds 1 x Communication Module 1 x Antenna 1 x User Manual